The type of Bittiolum is B. podagrinum, a Florida (Pleistocene?) fossil and
most likely a synonym of B. varium. But the older name B. alternatum (Say,
1822) which is usually regarded as a different (more northern) species
probably is a synonym as well, and should take precedence. According to
Houbrick (1993), there are also eastern Pacific congeners. Having a closer
look at the protoconch of B. varium (Houbrick's fig i), I would suggest the
species has planktotrophic larvae. For reasons to separate Bittiolum from
other genera (Houbrick recognizes 6 genera) you should consult the Houbrick
paper. I think some of the generic distinctions are debatable.
cheers,
Marien
----- Original Message -----
From: "Burton Vaughan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, June 21, 2004 6:57 PM
Subject: Re: Bittiolum vs Bittium
> Is the genus name you refer to, Bittiolum, applicable only to B.
> varium, or is it a generic name change for the Bittium genus; e.g., B.
> attenuatum (Carp.), B. catalinese (Bartsch), B. eschrichtii
> (Middendorf), etc. ?
>
> Burton Vaughan
>
> _______________________________________________
> From: "M. J. Faber"
> Date: Thu Jun 17, 2004 12:18:29 AM US/Pacific
> Subject: Re: Bittium and Diastoma
>
>
> The most important (and recent) information on this species is by
> Houbrick
> in Malacologia vol. 35 (1993).
> The genus is Bittiolum, not Bittium or Diastoma (the latter quite
> unrelated). The type of protoconch suggest planktotrophy (but it could
> be
> lecitotrophic).
>
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